Evaluation of diagnostic tests’ sensitivity, specificity and predictive values in bovine carcasses showing brucellosis suggestive lesions, condemned by Brazilian Federal Meat Inspection Service in the Amazon Region of Brazil

Souza, Márcio Rodrigues Dos Santos; Filho, Paulo Martins Soares; Hodon, Mikael Arrais; Souza, Patrícia Gomes de; Silva, Carlos Henrique Osório

doi:10.1016/j.prevetmed.2021.105567

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…On the other hand, contamination of carcasses is identified as one of the forms of condemnation. The main causes of condemnation of carcasses are related to diseases, in about 57%, especially tuberculosis [ 10 ] and brucellosis [ 35 , 57 ].…”

Section: Discussionmentioning

confidence: 99%

Perspectives of economic losses due to condemnation of cattle and buffalo carcasses in the northern region of Brazil

et al. 2023

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The work aims to study the economical losses of the condemnation of bovine and buffalo carcasses, in order to estimate the losses in animals slaughtered in Santarém-Pará, Brazil, between 2016 and 2018, with data obtained from the Municipal Department of Agriculture and Fisheries. Sex, age, origin, total number of animals slaughtered and causes of condemnation of carcasses were considered. All analyzes were performed in RStudio version 1.1.463. In this study, 71,277 bovine carcasses and 2,016 buffalo carcasses were inspected, of which 300 bovine and 71 buffalo were condemned. The highest prevalence of causes of condemnation in cattle was recorded for brucellosis (0.0020%) and tuberculosis (0.0019%). In buffaloes, tuberculosis (0.0307%) peritonitis (0,0019%) were the main causes of condemnations. Economical losses were more evident in females, for both species. The projection of economical losses related to the condemnation of carcasses showed a sharp growth for the next three years, if the average growth remains constant. The biggest projected loss was for bovine females, with an accumulated projection of $ 5,451.44. The smallest estimated loss was for buffalo males, projected at more than thirty-two thousand reais. The most important causes of condemnation report the diseases brucellosis and tuberculosis, as the ones with the greatest impact. In the buffalo species this was even more accentuated, even though the number of buffaloes slaughtered is more than 35 times smaller than the number of cattle.

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Section: Discussionmentioning

confidence: 99%

Perspectives of economic losses due to condemnation of cattle and buffalo carcasses in the northern region of Brazil

et al. 2023

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“…A falta de diretrizes distintas para o diagnóstico de casos de brucelose é uma das razões importantes por trás dessa condic ¸ão [2]. O fato da maioria dos animais infectados permanecerem assintomáticos quando infectados e de não ser esperado lesões inflamatórias intensas, nem lesões patognomônicas causadas por Brucella spp., corroboram com a estatística [5]. Estas características somadas a extensa área territorial Brasileira, grande efetivo de rebanhos, e outros fatores ameac ¸am o estabelecimento de ac ¸ões dos programas de defesa sanitária vigentes no Brasil.…”

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Rede neural artificial para predição de brucelose bovina a partir de dados desbalanceados

Queiroz Alves,

Ferreira,

Fortunato

et al. 2024

Anais Do XVI Congresso Brasileiro De Inteligência Computacional

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The expressiveness of Brazilian livestock is unquestionable. According to data from the United States Department of Agriculture (USDA), in 2021 Brazil was the worlds largest exporter of beef. Bovine brucellosis is one of the most worrying diseases for the sector. In Brazil, bovine brucellosis causes annual losses of around 448 million dollars. Several factors threaten the establishment of actions of the current animal defense programs in Brazil, the main ones being: lack of distinct guidelines for the diagnosis of brucellosis cases, infected animals remain asymptomatic when infected, extensive Brazilian territory and large number of herds. The use of Artificial Neural Networks (ANNs) can be very useful in health and epidemiological surveillance services, helping to screen properties with different risks for the disease. The objective of this work is the development of ANN with class balancing techniques and selection of variables via genetic algorithm, for the classification and segregation of bovine herds, regarding seroprevalence for brucellosis. Five ANNs were designed combining different approaches of class balancing technique and variable selection, in order to compare which approach would perform better results. The results showed that ANN combined with the variable selection technique, via Genetic Algorithms, and class balancing, is a promising approach.

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Effectiveness of the RB51 vaccine in controlling brucellosis in adult beef cows

Fernandes,

Pereira,

Pereira

et al. 2024

Front. Vet. Sci.

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IntroductionThe aim of this study was to compare the effectiveness of brucellosis control and reproductive performance using one or two doses of RB51 strain vaccine.MethodsThis experiment was conducted at two commercial beef farms (A, n = 477; and B, n = 673), which were selected due to their records of endemic brucellosis and a prevalence of 6 to 8% of seropositive cows. An initial serology screening (Day 0) was carried out in all cows using the Rose Bengal test (RB), and presumptive positive results were re-evaluated using a slow agglutination test with 2-mercaptoethanol (2-ME). Seropositive cows (64, 5.6%) were culled. Non-reactive cows were then randomly assigned into three experimental groups: G1, a single vaccination with RB51; G2, two doses of RB51 given 6 months apart; and G3 (control group), no vaccination. Serological tests were carried out on Days 90, 180, 270, and 360. In each evaluation, seropositive cows were removed. The variables related to occurrence of new infections and abortion, as well as those related to subsequent reproductive performance, were analyzed using the SAS software.Results and discussionSeropositive cows were still detected in both vaccinated and control groups at 90 days. However, no new infections were detected in G1 at 180 days or in G1 and G2 at 270 and 360 days, whereas new seropositive cows were diagnosed in all exams in G3 (control). Therefore, the cumulative number of new infections was lower in vaccinated than in control cows (0.2% and 0.0%, vs. 3.2% for groups G1, G2, and G3 respectively; p = 0.0002). In farm A the number of days open was greater in the control than in vaccinated groups (p < 0.05), and in farm B the pregnancy rate was lower in the control than in the group vaccinated once (p < 0.05). In summary, vaccination with RB51 in beef cows reduces the occurrence of new cases of brucellosis and improves the reproductive performance. There is no indication that a second immunization, six months after the first, enhances protection or reproductive efficiency.

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Evaluation of diagnostic tests’ sensitivity, specificity and predictive values in bovine carcasses showing brucellosis suggestive lesions, condemned by Brazilian Federal Meat Inspection Service in the Amazon Region of Brazil

Cited by 3 publications

References 41 publications

Perspectives of economic losses due to condemnation of cattle and buffalo carcasses in the northern region of Brazil

Perspectives of economic losses due to condemnation of cattle and buffalo carcasses in the northern region of Brazil

Rede neural artificial para predição de brucelose bovina a partir de dados desbalanceados

Effectiveness of the RB51 vaccine in controlling brucellosis in adult beef cows

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